Hi. I have lost 3 of my Skylanders ( Whirlwind, Ignitor & Thumpback) too. Whirlwind was actually in the sanctuary but shown as available to buy in the market. When I collected from the sanctuary I got a message that he was now level one and then he disappeared from the game. I think that the other 2 were not in use when they disappeared. I was foolish in trusting that my game data was safe because it was saved on the cloud. Has your problem been resolved or are you still waiting for help?

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